Combination lock



H. C. COY

COMBINATION Loox Dec. ll, 1928.

, Filed March 29, 192e FEE PatentedDec. l1', i928.

v,UNITED srAri-:s

HERBERT C. CY, F CHICAGO, ILLINOIS.

4Vio

PYI-`-`ENTg OFFICE.

. i COMBINATION LOCK.

Application filed March 29, V1926. Serial No. 98,057.

This invention relates to improvements in combination locks, having a plurality of tumblers in the form of disks, which are free to revolve in either direction and adaptedy to be rotated into and out of. engagement with a suitable keeper, said tumblers requiring separate adjustment for'opening the/lock'.

One of the important objects of this invention is to provide an improved form of combination or permutation lock which respondsequally to the sense ofvsight, hearing or touch, and which, therefore,s especially available for many uses, yparticularly for mailboxes, `and also for doors, drawers, lockers, desks, safes, chests, or the like.

Still another', and furtherimportant object of this inventionis the provision, in a permutation lock, of means for readily changing the combination thereof lwith a minimum expenditurev of time and labor, having at the same time the organization of the operating rparts of the lock with the object of providing aV simple, compact, inexpensive, but reliable box structure,

Other and further important objects of the invention will be apparent from the disclosures in the accompanying drawings and following specification.

The invention, ina preferred form, is illustrated in the drawings and hereinafter more fully described.

In the drawings:

Figure 1 is a front elevation of the improved permutationlock of this invention.

Figure 2 is a sectional view, taken on the line 2-2 of Figure 1.

Figure 8 is a detail view of one of the operating tumblers. f y

Figure 4 is a perspective view'of the other operating tumbler. y

Figure) 5 is a detail view of the operating knob. y k Y Figure 6 is a plan view of the pointer or indicator. Y i

Figure 7 is a top plan view of the device shown in Figure 5( i l Figure 8 is an end view of the locking nut.

and

Figure 10 is a vertical elevation of the keyY The reference numeral 12 indicates gener- Figure 9 is a planview of the lock washer,

ally a portion of a door panel or the like to which the lock is applied, the locking tumblers or' discs normally extending below the lower or one outer edge of the door. Certain portions of the discs are cut away tojpermit openingkfof the door in an obviousy manner` when the discs'are turned into correct posi-V tion. f

vTheplate 14, providedwith a series of numbered notches,is attached to the outer face of the door by means ofrivets `16 Aor the like,`and mounted to operate in this `plate is a rotatable'dial 18 having a pointer 20 there-` on as shown in Figures 1, 2,- and 6. The rotatable dial is moved by means `of amanuallyf operated knob 22mounte'd onthe end of an operating pin24, which extends completely through the lock and projects `at the rear end ythereof as best shown in Figure 2. The stem 24 is hexagonal in shape, as shown in Figure i 7, and fits into' a twelve-sided openingin the plate 18 and also into' a similar opening in"V4 the first disc 26.

v Asleevev 28 surrounds the stem 24 'adjavcent the knurled knob 22a'nd by means of a helical spring 30 is pushed-into proper posl tioning relation tothe plate or dialv 18.`

' The` second disc 32 has a. circulark hole in Y A washer i 38 is positioned between the tumblers so as to eliminate friction, the tumblers being held in position by means of an` overhanging plate 40, the ends of which extend downwardly past the discs and are soldered, riveted, or otherwise secured to the v rear face of the plate 12. A spring 56 prevents undesired motion of the rear tumbler. A locking nut42is screw threaded onto the end of the stem 24 and co-operates with a lock washer 44 which is-provided withan integral projecting key 46 adapted to be set in a corresponding slot in the stem 24. vThe locking i nut 42 istapered or frustro conical so asto eliminate any possibility of its beingturned by means of `any pliers or wrenches, and

notches 50 are formed in itsouter face which yare adapted to receive projecting lugs 52 V,integral with an cperating key 54, whereby the lock may be disassembled and the combi` nation'changed at will.

The notches in the plate 14 are deep enough to securely retain the pointer 20 of the dial 18 when the same is moved and the tensionof the spring 30 produces a definite click each time the pointer passes over a notch so that the lock may be readily operated in the dark and even by ablind person, providing the combination is known.

The number of the notches, the hexagonal stem, and the relation of the tumblers to the stem and to each other produce a practically infinite number of comblnations, and further, the lock is fool proof and also proof against tampering, while at the same time being readily operated by anyone knowing the combinat-ion.

I am aware that many changes may be made and numerous details of construction varied throughout a wide range without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted hereon otherwise than as necessitated by the prior art.

I claim as my invention:

1. In a permutation lock, the combination of a plurality of circular dises, each having a segment removed therefrom, an operating pin for rotating one of said discs, means on the discs for imparting motion from one to the other at certain portions of their movement, a dial mounted to rotate with the disc operating means, a pointer extending radially beyond the dial, a notched indicator in which said pointer rides, spring controlled means formaintaining said dial in desired position and producingaudible sounds upon movement ofthe pin in the notches, a combined rear support and bearing for the operating pin, and a locking nut and washer fixed on the pin bolt, said rear support to maintain all the parts in (so-operativeI relation. y

In a permutation lock, the combination of a plurality of circular' discs, each having a segment removed therefrom, an operating pin for rotating one of said discs, means on the discs for imparting motion from one to the other at certain portions of their movement, a dial mount-cd to rotate with the disc operating means, a notched indicator for the dial, .spring controlled means for maintaining said dial in desired position and producing' audible clicks upon movement, a combined rear support and bearing for the operating pin, and a'locking nut and washer fixed on the pin bolt, said rear support to maintain all the parts in co-operative relation, said lock nut being of frustro conical shape.

3. In a combination lock, the combination of a })lurality of locking discs, an operating spindle peripherally supporting the discs,-

one of said discs having a central twelvesided opening in which said spindle fits in a plurality of determined positions, a knurled operating knob on the spindle hexagonal in cross-section, a pointer removable from but movable with the spindle, a notched dial over 4 which said spindlemovable, and resilient means for maintainingthe pointer in cooperative relation with the notches in the dial, and to produce audible sounds upon movement of the pointer over said notches.

In testimony whereof I affix my signature HERBERT o. ,ooY 

